[C:1]1([O:7][CH3:8])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[CH:9]1[C:18]2[C:13](=[CH:14][CH:15]=[CH:16][CH:17]=2)[CH:12]=[CH:11][C:10]=1[C:19](Cl)=[O:20].FC(F)(F)S([O-])(=O)=O.[Yb+3].FC(F)(F)S([O-])(=O)=O.FC(F)(F)S([O-])(=O)=O>[N+](C)([O-])=O>[CH:9]1[C:18]2[C:13](=[CH:14][CH:15]=[CH:16][CH:17]=2)[CH:12]=[CH:11][C:10]=1[C:19]([C:4]1[CH:5]=[CH:6][C:1]([O:7][CH3:8])=[CH:2][CH:3]=1)=[O:20]To commercially available nitromethane (10 ml) were added commercially available anisole (1.081 g), commercially available 2-naphthoyl chloride (1.906 g) and commercially available ytterbium(III) trifluoromethanesulfonate (620 mg), and the admixture was stirred at 60° C. for 8 hours. The reaction mixture was partitioned between water and chloroform, and the chloroform layer was then dried with anhydrous magnesium sulfate. After removing the solvent by reduced-pressure distillation, the resulting residue was purified by column chromatography on silica gel eluting with hexane/ethyl acetate to obtain 817 mg of the title compound (yield: 31%).
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